How can you get rights for the 2nd admin-user in Ubuntu?
My window-manager is Ion3.
I get the following errors for X11 applications run by the second admin-user.
masi@masi-desktop:/home/noa$ firefox No protocol specified Error: cannot open display: :0.0
This suggests me that you need to have rights to the display.
su -c xterm is not working, since the root password is disabled in Ubuntu.